Flight Tests of Retractable Ailerons on a Highly Tapered Wing
This is a 1939 aeronautical technical report from the NACA, a government research body, issued to aviation engineers and aircraft designers, documenting flight tests of retractable ailerons on a highly tapered wing. Its three figures are a planform drawing of the wing with dimensioned spans and a shaded aileron outline, a photograph of a slender tapered wing with a row of hinged panels along its trailing edge, and a graph plotting roll rate in degrees per second against air speed in miles per hour, with two fitted curves. A designer might take from them the clean line-drawing style of engineering plans and the sparse, measured look of plotted test data.
